Read by QxMD icon Read

Ventricular myocardial band

D M Schwab, L Tilemann, R Bauer, M Heckmann, A Jungmann, M Wagner, J Burgis, C Vettel, H A Katus, A El-Armouche, O J Müller
The downregulation of β-adrenergic receptors (β-AR) and decreased cAMP-dependent protein kinase activity in failing hearts results in decreased phosphorylation and inactivation of phosphatase-inhibitor-1 (I-1), a distal amplifier element of β-adrenergic signaling, leading to increased protein phosphatase 1 activity and dephosphorylation of key phosphoproteins, including phospholamban. Downregulated and hypophosphorylated I-1 likely contributes to β-AR desensitization; therefore its modulation is a promising approach in heart failure treatment...
January 2018: Gene Therapy
Serkan Asil, Barış Kaya, Uğur Canpolat, Hikmet Yorgun, Levent Şahiner, Cem Çöteli, Anıl Arat, Kudret Aytemir
AIMS: Percutaneous septal reduction therapy by either alcohol or nonalcohol agents is an alternative approach to surgery in drug-refractory symptomatic patients with hypertrophic obstructive cardiomyopathy (HOCM). Nonalcohol agents have some advantages and disadvantages over alcohol during the procedure. Nowadays, a novel non-alcohol agent, named as Ethylene-vinyl alcohol (EVOH) copolymer (Onyx® and Squid® ), is used during septal ablation. Thus, in this study, we aimed to evaluate both acute and long-term efficacy and safety profile of EVOH during septal ablation in HOCM...
December 5, 2017: Catheterization and Cardiovascular Interventions
Iuliu Scurtu, Flaviu Tabaran, Mircea Mircean, Gavril Giurgiu, Andras Nagy, Cornel Catoi, Dan G Ohad
BACKGROUND: Double chambered right ventricle (DCRV) is a congenital heart anomaly where the right ventricle is divided into two chambers. We describe, for the first time, an unusual combination of DCRV combined with some other congenital heart defects. CASE PRESENTATION: A 1.2-year-old Golden Retriever was presented with lethargy, exercise intolerance and ascites. Physical examination revealed an irregularly irregular pulse and a grade V/VI, systolic, right cranial murmur...
November 29, 2017: BMC Veterinary Research
Lei-Lei Ma, Yang Li, Pei-Pei Yin, Fei-Juan Kong, Jun-Jie Guo, Hong-Tao Shi, Jian-Bing Zhu, Yun-Zeng Zou, Jun-Bo Ge
Left ventricular hypertrophy (LVH) is causally related to increased morbidity and mortality following acute myocardial infarction (AMI) via still unknown mechanisms. Although rapamycin exerts cardioprotective effects against myocardial ischemia/reperfusion (MI/R) injury in normal animals, whether rapamycin-elicited cardioprotection is altered in the presence of LVH has yet to be determined. Pressure overload induced cardiac hypertrophied mice and sham-operated controls were exposed to AMI by coronary artery ligation, and treated with vehicle or rapamycin 10 min before reperfusion...
January 16, 2018: Clinical Science (1979-)
David H MacIver, John B Partridge, Peter Agger, Robert S Stephenson, Bastiaan J D Boukens, Camilla Omann, Jonathan C Jarvis, Henggui Zhang
Two of the leading concepts of mural ventricular architecture are the unique myocardial band and the myocardial mesh model. We have described, in an accompanying article published in this journal, how the anatomical, histological and high-resolution computed tomographic studies strongly favour the latter concept. We now extend the argument to describe the linkage between mural architecture and ventricular function in both health and disease. We show that clinical imaging by echocardiography and magnetic resonance imaging, and electrophysiological studies, all support the myocardial mesh model...
September 25, 2017: European Journal of Cardio-thoracic Surgery
David H MacIver, Robert S Stephenson, Bjarke Jensen, Peter Agger, Damián Sánchez-Quintana, Jonathan C Jarvis, John B Partridge, Robert H Anderson
The concept of the 'unique myocardial band', which proposes that the ventricular myocardial cone is arranged like skeletal muscle, provides an attractive framework for understanding haemodynamics. The original idea was developed by Francisco Torrent-Guasp. Using boiled hearts and blunt dissection, Torrent-Guasp created a single band of ventricular myocardium extending from the pulmonary trunk to the aortic root, with the band thus constructed encircling both ventricular cavities. Cooked hearts can, however, be dissected in many ways...
August 24, 2017: European Journal of Cardio-thoracic Surgery
Julien I E Hoffman
Ventricular twisting, essential for cardiac function, is attributed to the contraction of myocardial helical fibers. The exact relationship between ventricular anatomy and function remains to be determined, but one commonly used explanatory model is the helical ventricular myocardial band (HVMB) model of Torrent-Guasp. This model has been successful in explaining many aspects of ventricular function, (Torrent-Guasp et al. Eur. J. Cardiothorac. Surg., 25, 376, 2004; Buckberg et al. Eur. J. Cardiothorac. Surg...
September 2017: Physiological Reports
Egmond S Evers, Varsha Walavalkar, Suresh Pujar, Latha Balasubramanian, Frits W Prinzen, Tammo Delhaas, Ward Y Vanagt, Shreesha Maiya
INTRODUCTION: The early identification of vulnerable pediatric cardiac surgery patients can help clinicians provide them with timely support. Heart-type fatty acid-binding protein. (H-FABP) is an early biomarker of myocardial injury in acute myocardial infarction in adults. In this study, we evaluated the correlations between postoperative H-FABP, creatine kinase-myocardial band (CK-MB), troponin-I, total bypass time, and clinical outcomes. METHODS: In 32 pediatric patients that underwent ventricular septal defect...
September 2017: Annals of Pediatric Cardiology
Sae Jang, Rebecca R Vanderpool, Reza Avazmohammadi, Eugene Lapshin, Timothy N Bachman, Michael Sacks, Marc A Simon
BACKGROUND: Right ventricular (RV) diastolic function has been associated with outcomes for patients with pulmonary hypertension; however, the relationship between biomechanics and hemodynamics in the right ventricle has not been studied. METHODS AND RESULTS: Rat models of RV pressure overload were obtained via pulmonary artery banding (PAB; control, n=7; PAB, n=5). At 3 weeks after banding, RV hemodynamics were measured using a conductance catheter. Biaxial mechanical properties of the RV free wall myocardium were obtained to extrapolate longitudinal and circumferential elastic modulus in low and high strain regions (E1 and E2, respectively)...
September 12, 2017: Journal of the American Heart Association
Toshinobu Kazui, Phat L Tran, Tia R Pilikian, Katie M Marsh, Raymond Runyan, John Konhilas, Richard Smith, Zain I Khalpey
BACKGROUND: Temporary mechanical circulatory support device without sternotomy has been highly advocated for severe cardiogenic shock patient but little is known when coupled with amniotic stem cell therapy. CASE PRESENTATION: This case reports the first dual therapy of temporary left ventricular extracorporeal device CentriMag with distal banding technique and human amniotic stem cell injection for treating a severe refractory cardiogenic shock of an 68-year-old female patient...
September 7, 2017: Journal of Cardiothoracic Surgery
Richie Manikat, Julieta Gilson, Mahesh Krishnamurthy, Koroush Khalighi
Introduction: Sarcoidosis is described as a systemic condition characterized by non-caseating granulomas in multiple organs. In this report, we present an unusual manifestation of cardiac sarcoidosis and review management strategies. Case presentation: A 29-year-old African-American man presented with weight loss, fatigue, dyspnea, palpitations, night sweats, painless left eye redness and bilateral leg pain over the course of three months. His physical exam revealed left conjunctival congestion and bilateral crackles on auscultation...
July 2017: Journal of Community Hospital Internal Medicine Perspectives
Brody Wehman, Nicholas Pietris, Grace Bigham, Osama Siddiqui, Rachana Mishra, Tieluo Li, Emily Aiello, Godly Jack, Wendy Wang, Sarah Murthi, Sudhish Sharma, Sunjay Kaushal
BACKGROUND: C-kit+ cardiac progenitor cells (CPCs) have been shown to be safe and effective in large-animal models and in an early-phase clinical trial for adult patients with ischemic heart disease. However, CPCs have not yet been evaluated in a preclinical model of right ventricular (RV) dysfunction, which is a salient feature of many forms of congenital heart disease. METHODS: Human c-kit+ CPCs were generated from right atrial appendage biopsy specimens obtained during routine congenital cardiac operations...
December 2017: Annals of Thoracic Surgery
Heiner Latus, Mohamed S Nassar, James Wong, Pauline Hachmann, Hannah Bellsham-Revell, Tarique Hussain, Christian Apitz, Caner Salih, Conal Austin, David Anderson, Can Yerebakan, Hakan Akintuerk, Juergen Bauer, Reza Razavi, Dietmar Schranz, Gerald Greil
OBJECTIVE: Norwood and hybrid procedure are two options available for initial palliation of patients with hypoplastic left heart syndrome (HLHS). Our study aimed to assess potential differences in right ventricular (RV) function and pulmonary artery dimensions using cardiac magnetic resonance (CMR) in survivors with HLHS. METHODS: 42 Norwood (mean age 2.4±0.8) and 44 hybrid (mean age 2.0±1.0 years) patients were evaluated by CMR after stage II palliation prior to planned Fontan completion...
February 2018: Heart: Official Journal of the British Cardiac Society
Jonas Selmeryd, Egil Henriksen, Håvard Dalen, Pär Hedberg
OBJECTIVES: This study aimed to derive age-specific multivariate reference regions (MVRs) able to classify subjects into those having normal or abnormal filling patterns and to evaluate the prognostic impact of this classification. BACKGROUND: The integration of several parameters is necessary to diagnose disorders of left ventricular (LV) filling because no single measurement accurately describes the complexity of diastolic function. However, no generally accepted validated multiparametric algorithm currently exists...
July 13, 2017: JACC. Cardiovascular Imaging
Eva Amalie Nielsen, Kenichi Okumura, Mei Sun, Vibeke E Hjortdal, Andrew N Redington, Mark K Friedberg
Death and morbidity in pulmonary arterial hypertension (PAH) are often due to right ventricular (RV) failure and associated left ventricular (LV) dysfunction. We investigated regional myocardial remodeling and function as the basis for adverse ventricular-ventricular interactions in experimental chronic RV pressure overload. Two distinct animal models were studied: A rabbit model of increased RV pressure-load through progressive pulmonary artery banding A rat model of monocrotaline (MCT)-induced pulmonary arterial hypertension (PAH)...
July 2017: Physiological Reports
Dayong Wu, Zongyao Zhang, Rongzheng Ma, Feng Guo, Lei Wang, Wei Fang
AIM: The aim of this study was to compare CZT-SPECT (CZT SPECT) to conventional SPECT (C-SPECT) in the assessment of left ventricular myocardial scar, contractile function, and mechanical synchrony in patients with heart failure (HF). METHODS: Fifty-nine patients with HF who were referred for myocardial perfusion/metabolism imaging were enrolled. All patients underwent resting (99m)Tc-MIBI gated myocardial perfusion imaging using a CZT SPECT camera and a C-SPECT camera, respectively, and (18)F-FDG PET myocardial metabolism imaging within three days...
June 16, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
Sara Gattoni, Åsmund Treu Røe, Jan Magnus Aronsen, Ivar Sjaastad, William E Louch, Nicolas P Smith, Steven A Niederer
KEY POINTS: At the cellular level cardiac hypertrophy causes remodelling, leading to changes in ionic channel, pump and exchanger densities and kinetics. Previous studies have focused on quantifying changes in channels, pumps and exchangers without quantitatively linking these changes with emergent cellular scale functionality. Two biophysical cardiac cell models were created, parameterized and validated and are able to simulate electrophysiology and calcium dynamics in myocytes from control sham operated rats and aortic-banded rats exhibiting diastolic dysfunction...
June 15, 2017: Journal of Physiology
Nadine Abanador-Kamper, Lars Kamper, Marc Vorpahl, Hilmar Brinkmann, Vasiliki Karamani, Patrick Haage, Melchior Seyfarth
Despite prompt revascularization, some patients with acute myocardial infarction (AMI) develop myocardial scars, which can be visualized by late gadolinium enhancement (LGE) in cardiovascular magnetic resonance imaging (CMR). Our goal was to identify angiographic findings that were predictive for scar development in patients after reperfused AMI.We examined 136 patients after first ST-elevated myocardial infarction by CMR after a median of 4 days (range: 2-7). Patients with manifestation of LGE were matched to patients without LGE by means of age and gender...
May 2017: Medicine (Baltimore)
Michael A Guttman, Susumu Tao, Sarah Fink, Aravindan Kolandaivelu, Henry R Halperin, Daniel A Herzka
PURPOSE: To demonstrate imaging of radiofrequency ablation lesions with non-contrast-enhanced T1 -weighted (T1w) MRI. METHODS: Fifteen swine underwent left ventricular ablation followed by MRI using different preparations: endocardial or epicardial ablation of naïve animal, or endocardial ablation of animal with myocardial infarction. Lesion imaging was performed using free-breathing, non-contrast-enhanced, T1w sequence with long inversion time (TI). Also acquired were T1 maps and delayed contrast-enhanced (DCE) imaging...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Jiayuan Huang, Jian Wu, Shijun Wang, Jieyun You, Yong Ye, Zhiwen Ding, Fenghua Yang, Xingxu Wang, Junjie Guo, Leilei Ma, Jie Yuan, Yunli Shen, Xiangdong Yang, Aijun Sun, Hong Jiang, Liping Bu, Peter H Backx, Junbo Ge, Yunzeng Zou
In mice, myocardial hypertrophic preconditioning (HP), which is produced by the removal of short-term transverse aortic constriction (TAC), was recently reported to render the heart resistant to hypertrophic responses induced by subsequent reconstriction (Re-TAC). However, there is no efficient noninvasive method for ensuring that the repeated aortic manipulations were successfully performed. We previously demonstrated that ultrasound biomicroscopy (UBM) is a noninvasive and effective approach for predicting TAC success...
July 1, 2017: American Journal of Physiology. Heart and Circulatory Physiology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"